Carburetor



June 2, 1931. o. z. FRAzlER 1,808,537

CA'RBURETOR Filed April 17, 1926 l LvVENToR. .OJ'I/I/e. Z. frayer A TToRNEY.

Patented June 2, 1931 UNITED STATES PATENT OFFICE ORVILLE Z. FBAZIER, OF RIVER ROUGE, MICHIGAN, ASSIGNOR OF ONE-HALF T0 B.. J. ST. LOUIS,` OF RIVER ROUGE, MICHIGAN CARBURETOR Application led April 17,

This invention relates to carburetors for internal combustion engines. This application may be regarded as an improve-ment upon my co-pending application, Serial Number 49,244 filed October 10, 1925, which has matured into Patent 1,778,215, granted October 14, 1930.

Itis an Ob'ect of the invention to provide a ioatless car uretor comprising means arranged in the fuel mixture passage automatacally responding to the flow through said passage and exercising control of the fuel delivery to the mixing chamber of the carburetor.

Another object of the invent-ion is to provide dual nozzles for the discharge of liquid i. fuel to the mixing chamber of a carburetor,

and to control the discharge from said nozzles by dual valves automatically responsive to the mixture flow through said passages,

, and to provide means for progressively and successively establishing said passages in communication with the engine.

A further object is to provide a fioatless carburetor havin dual valve controlled fuel outlets to the mixing chamber, one for .operation under low speed conditions, and theV other for delivering fuel to operate the engine, atrelatively high speeds, and to provide for permanently setting the low speed fuel valve and for control of the high speed valve from the drivers seat.

These and various other objects the invention attains. by the construction hereinafter described, and illustrated in the accompanyina drawings, wherein:

igure 1 is a view of the improved carburetor in longitudinal vertical section, taken on the line 1-1 of Figure 3.

Figure 2 is a horizontal sectional view of the same taken on the line 2-2 of Figure 3.

Figure 3 is a view of the outlet end of the carburetor.

Figure 4 is a vertical section taken on line 4-4 of Figure 1.

Fi re 5 is a longitudinal vertical sectiona view of an alternative construction.

In these views, the reference characters .1 and 2 designate two members bolted together as indicated at 3 to form the body of the car- 1926. Serial No. 102,632.

buretor. The member 1 has in one of its end portions, dual mixing chamber 4, formed by a partition 4a, the other end portion of said member forming an air inlet 4b to said mixing chambers. The inlet 4b is controlled by 55 a suitable choke valve 5y preferably of the butteriy type, and an arm 5a which m-'ay be extended to be operable from the drivers seat of a vehicle.

The member 2 h as a partition 6 therein so forming two mixture passages 7 and 8 extending from end to end of said member, and separately communicating at one end of said member with the yrespective mixing chambers, as indicated at 9 andv 10; The openings 65 of said passao'esat the other end of the member 2 are indlcated at 11 and 12, the opening 12 being considerably more restricted. The last mentioned end of the member 2 is formed with an outstanding flange 18 engageable by 70' bolts 14 which secure the carburetor to an intake manifold 15. Between said manifold and the carburetor there is clamped a metal plate 16 formed with an opening 17 through which fuel mixtures are adapted to discharge 'i5 tothe manifold from the passages 7 and 8. Within the opening 17 a circular shutter 18 is pivoted as indicated at 19 to control the passages 7 and 8, said opening being of sufficient size to permit travel `of said shutter Se from the limiting position shown in full lines in Figure 3, in which said shutter clears both openings 11 and 12 to the'otherlimiting position indicated in dash lines in said figure, in which the shuttercloses both of said open- S5 ings. It isto be noted that the arrangement is such that the'shutter in its opening travel is adapted to first progressively uncover the opening 12 and thereupon to progressively uncover the o ening 11. '20 designates a con- 90 trol arm suita 1y connected to the shutter and actuable by a control rod 21 Whichmay be extended to the vicinity o f the drivers seat.

The member 1 is formed with an upstanding integral extension 22 in which are ver- 95 tically mounted two needle valves23 and 24 controlling communication between a liquid ,fuel supply duct 25 and the discharge passages' 26 of two nozzles 27 and 27a, which e open in the direction of ow through the mixing chambers 4 and 4a and are respectively aligned with the openings 9 and 10..

The valve 23 controlling the nozzle registering with the more restricted .passage- 8 is adapted to be permanently adjusted to provide for a suitable fuel supply to the nozzle and the lock nut 28 maintains such adjustment. The other needle valve ll24 is adjustable according to the particular conditions of operation, a control rod 29 being universally joined as indicated at 30 to the projecting upper end of said valve. j

31 designates a second pair of needle valves which pass respectively through the openings 9 and 10 in the direction of How of the mix?y ture, and `which are adapted to seatwithin the discharge ends ofthe nozzles 27 to control the fuel outlets 26. Within the chamber 2 the valve members 31 respectively carry disc closures 32 for the openings'9 and 10said closures substantially closing said openings when said valve members are engaged with their seats in the nozzles 27. Said valve members slidably engage. guide lugs. 33

formed upon the member 2 in the passages 7' and 8, and coiled springsV 34 mounted upon.

, sulting in an automatic openin of the closure (ill disc 32 which registers with t e opening 10, said disc thus actuating the associated valve member 31 from its seat in the nozzle '17 to an extent proportioned to the pressure drop in the passage 8 and thus allowing a 'disf charge of fuel to the mixing chamber proportionate to such pressure drop.

vUpon a further opening actuation of the shutter 18, the opening 11 will be progressively uncovered, communicating from the L intake manifold a pressure drop to the passage 7 and causing the disc 32 to withdraw from the opening 9 and to reseat the associated valve member 31 to an extent proportionate to the uncovering of the opening 11. Thus the discharge of fuel into the mixing chamber is automatically controlled by pressure conditions in the passages 7 and 8, and these conditions are regulated in common by the shutter 18.

For operating an engine at low speed as underidling conditions, vthe shutter 18 may be opened only suiciently to uncover (or partly uncover) the opening 11 so that a mixture will flow to the intake manifold only through the relatively restricted passage 8.

For operating at higher speeds, or under load, the shutter 18 is shifted sufficiently to uncover, either in part or completely, the opening 11 under which condition mixture is delivered'to the manifold through both passages 7 and 8.

The described automatic control of the fuel and the valve'members 37 are vertically arranged in said passages, their, tapered lower extremities being adapted toI seat within the upturned ends of the nozzles 39.l This arrangement presents the advantages that the previously described-springs may be elimihated, the weight of the stems 37 and of the discs 40 carried by said stems being suilicient to normally seat said valve member.

Itis'a desirable feature -of the described carburetor that the usual float and'iloat chamberand the annoyance-and uncertainty resulting fromftheir use are, eliminated,- and. v that thei flow producedby the pressure drop in an intake manifold is utilized to automatically exercise a positive control ofthe fuel supply through the mixing chamber.

From the foregoing it becomes evident that the. device is simple and eicient'andprovides means which accomplish the objects described.

While it will be apparent that the illustrated embodiment of'my invention herein disclosed is Well calculated to adequately fulfill the objects and advantages primarily stated, it is to beunderstood that the invention is susceptible to variation, modification and change within the spirit and scope of the subj oined claim. .i

Having thus described my invention, I claim:

' A. 'carburetor having dual mixture passages, differentially restricted, means for dellvering a mixture to said passages, means in each of said passages automatically regulating the flow therethrough, a fiat plate secured to said carburetor having an opening through which said passages discharge, and a flat plate pivoted in said opening in back of the first mentioned plate and successively movable across said passages to open and close the same.

In witness whereof I hereunt i set my hand.

' ORVILLE Z. FRAZIER. 

